Nvidia GTX250( Ubuntu 12.10 64) after install drivers - 304.51.really.304.43-0ubuntu1(there was x3 point of 96, 173, current- video change to 1600x1200(without left panel, without borders(file,help,go)). I opened (by right mouse lick) and changed to 1024x768 = lines and nothing else(but ubuntu works! So how repair it back to normal? Thank's for all how will tell me how to! (Sorry about my English).

There is also a "user friendly" way to do the change stated by Evandro Silva.

When you get to the screen without a "desktop", click the right button on your mouse and open "Change Desktop Background". When you are there, click on "All Settings". Go to the "System" sub-menu and click on "Software Sources". Then go to "Additional Drivers" and revert back (select it) from the menu, as stated by Silva.

Although easy, not everyone is familiar with the "Terminal", so this is a good way to explain customers how to do this without the need to know how to use terminal.